Engineering Board Exam Reviewer · Three-Phase Systems in Power Applications · medium
A balanced wye-connected load, with Z=15+j20, in each phase, is supplied from a three-phase line of 208 V (line-to-line, rms). Find the line current.
- 4.8 A
- 8.32 A
- 9.61 A
- 2.4 A
Answer
A. 4.8 A
Solution
Vph=VL/ 3= 208 V 3=120 V and |Z|=25, . In a wye connection the line current equals the phase current: IL= Vph|Z|= 120 V25, =4.8 A.
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